how to use lsim command in matlab ?

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Aniket
Aniket 2013-3-21
hello
i want to use lsim command to plot graph for system , i have read help but not getting proper idea
here is my code
***********************
clear all; clc; close all
load sec_sumsin_ABCDmatrix.mat % data As,Bs,Cs,Ds
syss=ss(As,Bs,Cs,Ds,0.001);
syssc=d2c(syss,'tustin');
[Asc,Bsc,Csc,Dsc]=ssdata(syssc);
nx=10; % states
ny=1; % output
nu=1; % input
M=diag([1.8108e0*ones(1,ny)]); %3.3058e-4];
QX=Csc'*M*Csc;
f=zeros(nx,1);
g=zeros(1,nx);
QU=diag([3.9805e-8*ones(1,nu)]);
QXU=[QX f;g QU];
n=randn(11,11)
KlQG=lqg(syssc,QXU,n)
[aa,bb,cc,dd]=ssdata(KlQG)
KlQG.InputName = 'q'; KlQG.OutputNmae = 'u';
syssc.InputName = 'u'; syssc.Outputname = 'y';
sum = sumblk('q = n + y');
sysc = connect(syssc,sum,KlQG,'n','y')
******************************************
in the figure shown (n) is noise added at output side of plant and measure output is (q) and i want to use lsim command to plot results from noise to measure output , how should i do this ?

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Arkadiy Turevskiy
Arkadiy Turevskiy 2013-3-21
Is the code you provided giving you an error? Once you build your transfer function from n to y, you should be able to simulate it with lsim:
t = 0:0.01:5;
u = sin(t);
lsim(sysc,u,t);
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Arkadiy Turevskiy
Arkadiy Turevskiy 2013-3-21
Sorry, I did not read your initial question carefully: you want response to the measured output, with noise included. In that case you simply do:
sysc = connect(syssc,sum,KlQG,'n','q');
% transfer function from noise to measured output
t = 0:0.01:5;
n = sin(t); %replace with desired input
lsim(sysc,n,t);
Aniket
Aniket 2013-3-21
Thank You
Could I send you email if i have a doubts because this area is new for me

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